Akan, Reaper of Souls

Deathtouch
If Akan, Reaper of Souls would die during
combat on your turn, you may sacrifice another creature. If you do, Akan, Reaper of Souls gains indestructible until end of turn.
Whenever Akan, Reaper of Souls kills a creature
during combat, Akan, Reaper of Souls gains indestructible until end of turn.